Rock-drilling mechanism



Patented May ll, 1926.

UNITED STATES PATENT. orFlcE.

ELMER G. GARTIN, OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVA'N MA- i CHINERY COMPANY, A GORPORATIGNQF MASSACHUSETTS.

Application led December 28, 1922.- Serial No. 609,399.

My invention relates to rock drilling mechanism,` and more particularly to improved controlling mechanisms for rock drilling mechanisms of the pneumatically fed type. i

An object of my invention is to provide an improved rock drilling mechanism. Another object of my invention is to provide an improved rock drilling mechanism of the pneumatically fed type having` improved controlling means. A further object of my invention is to provide an improved rock drilling mechanism of the so-called stoper type having improved means for enabling a ready and absolute control. of said mechanism. Other objects and advantages of my invention will hereinafter' more fully appear.

In the accompanying drawings I have shown for purposes of illustration two forms which my invention may assume in practice.

In these drawings, y

Fig. 1 is a side elevation, with parts broken away, of one form which my invention may assume in practice.

Fig. 2 is an enlarged detail sectional view showing details of one form of my improved controlling mechanism.

Fig. 3 is a view similar to Fig. 2 'showing a modified form of construction.

In the accompanying drawings I have for purposes of illustration shown my invention used in connection `with a drilling mechanism of the socalled stoper type, which mechanism is generally designated 1. This mechanism comprises a motor 2 adapted to percussively actuate a hollow drill steel 4. At the rear end of the motorfis an intermediate head block 5 to which there is connected a motor and feed controlling means in the form of a valve mechanism whose controlling lever 6 is seen to the left of Fig. l. This mechanism controls the supply of motive fluid to the drill motor 2'and controls the fluid supply for a feeding mechanism generally designated 7. The feeding mechanism comprises a feed cylinderV 8, herein connected to the intermediate head Vand having a bore 9 in which a piston 10 is arranged. The piston 10 has a piston rod 11 which terminates at itsend in an abutment engaging point 12. During operation the point 12 is placed in engagement with a fixed'ahutment and upon admission of air to the feed cylinder bore 9 at a point above the piston 10, the feed cylinder 8 and the drilling mot-or 2 are simultaneously fed forward. l l f For the purpose of providing a more adequate and instantaneous control of the oper` ation of the feeding mechanism thancan be accomplished bythe handle 6, I have arranged upon a laterally projecting handle 14% (which handle is in general outline similar to those customarily used rfor supporting or rotating stoping drills during operation and whichv includes 'a manual grasping portion 15 projecting at right angles to the drilling mechanism and a second portion 16 at right angles to the mainportion 15) suitable '.f

controlling mechanism which I shall now describe. L In the form of my inventionshown in Figs. 1 and 2, the handle 14: is made hollow, as indicated at 17, to form a chamber in which lubricantmay be storedyand at its outer end is provided with'a transverse slot 18fin which a lever 19 of the general shape of a bell crank lever and having angularly related manual grasping portions '2O and 2l is pivoted. This lever is suitably connected by 4appin and slot'connection 22 with a rod 23 which extends through the chamber 17 and into a chamber 24 formed in part in 'thel inner end of the handle V14 and in part in a boss 25 on the intermediate head 5. Within the chamber'the rod is provided with a collar26 with which a spring 26 cooperates to move the rody toward the right 1n Fig. 2. At its extreme left Vhand end in Fig. 2, that is, its end nearest the axial line of the drilling mechanism, the rod is formed with a valve portion 27 which cooperates with a port 28 leading from and controlled by the valve mechanism 6, and this valve portion 27 controls the passage of fluid from the port' 28 to a passage 29 leading to the upper end of the bore of the feed cylinder 8. A. valve seat 30 with which the end of the rod 23 may cooperate permits the complete interruption of fluid supply from the port 28 to'the'port 29. e

The modeof 4operation of this form of my inventionwill be readily apparent. The drill runner can, byv grasping either the portion 15 or the portion 16 of the handle and 'simultaneously grasping the arms 20 or 21 of the lever, cause the valve portion 27 to partially or wholly close communication between the ports 28 and 29 and so may control t-he rate of feed. -It will be evident that llll at whichever of the two places the handlev Fig. "3, I have illustrated a modified form of controlling mechanism, The handle 14 is provided with similar portions 15 and 16 and with a transverse slot 18. A branched lever mechanism 32, which has an.- gularly disposed grasping portions 33 and 34, is pivoted 4as=at 35 with its ythird arm 36 projecting in'torth'eslot 18. The last ymentioned arm is connected by a pin and slot connection 37 with a rod 38 extending through aportion of the handle 14. The rod 38 at its left hand end, .that is, the end nearest the axis of the controlling mechanism, is provided with a plurality of grooves 39 and v40 separated by a head or spool 41 and adjacentfits extreme inner end is a second `cylindrical portion 42 similar in diameter to the portion 41. A button 43 is formed'at the endof the portion .42 and a spring 414 housed in the chamber 45 kin the boss 25 together with an opposing spring 46 in an oppositechamber47, normally maintains the rod 38 -in the position shown in Fig. 3. A passage 28 leads from the valve member 6 and a passage 29 vleads to the bore of the feed cylinder, as in the preceding construction, rwhile a vent 48 to fatmosphere is arranged on the opposite side of the port 29 from the passage. 28.

The mode of operation of this form of my inventionV will be readily apparent. Assume that the portion 16 of the handle and the arm 34 of the lever 32 are tightly grasped. This will cause a movement to the left of the rod 38 in a manner to interrupt the supply of fluid from the ports 28 and 29, a sulhciently great angular vmovement of the lever arm 34 toward the handle yp0rtion 16 being sufficient to interrupt communication entirely between the passages 28 and '29 and yso to `interrupt the feed promptly. lOn the other hand, the simultaneous tight grasping of the :portion of the handle 15 and-the lever arm A3'3-will move the rod 38 to the right and will not only interrupt the communication between the ports 28 and-29 by the overrunning of the latter byithe spool 41, but will furthermore interconnect the `port v29 with the vent 46 to theatmosphereso 1that the lforceof the 'feed will be practically instantly discontinued. It will thus be seen that,no matter whichhandle 33 or 34 is moved, the feed will be `reducedby the closure'of communication between thepassages 28 and y29 and it. will be further noted that if thehandle 33 is grasped, the vent 48 will be opened and yso the reduction in feed :pressure will be even more prompt.

lVhile I have in this application specifically 4described two forms which myginvention may assume in practice, it will be understood that these forms of the same are shown for purposes of illustration and that the invention may be modified and embodied in other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a drilling mechanism, the combination .with drill feedingmeans `and a handle projecting from the drill and having an gularly disposed grasping portions, of feed controlling means comprising a controlling element, and operating means for said element including an operating member havin g angularly related operating portions disposed in yjuxtaposition with said'grasping portions.

2, In a drilling mechanism, the combination `with a fluid actuated kfeeding means and a drill supporting handle projecting laterally at one side of the drill and having angularly disposed grasping portions, of means for controlling said `feeding means including angularly relatedy controlling elements disposed in juxtaposition with said grasping portions.

3. In a drilling mechanism, the combina tion with a pressure lliuid actuated feeding means and a drill supporting. handle yprojecting ylaterally at one side of the drill and having .angularly disposed grasping portions, of means for controlling said yfeeding means including a valve, and operating means for :said valve including angularly related controlling elements cooperating i therewith disposed in juxtaposition with vsaid .grasping portions.

4. In a drilling mechanism, the combination with a fluid actuated feeding means ,and supporting handle Iprojecting laterally at one side ofthe'drill Vand having angularly disposed grasping portions, means for controlling said feeding means including a valve movably mounted Within one of said .grasping portions, and means for operating said valve including angularly related controlling velements cooperating therewith disposed in'juxtaposition withl said grasping portions. f

5. In a drilling mechanism, the combination `with a pressurefluid'actuated feeding means, `and a drill supporting handle ern tending laterally at one side of the drill and having angularly disposed grasping portions at its -outer extremity, of feed conltrolling means including a valve for ena-bling the operator to control the pressure in said feeding means in accordance with the requirements of the work, and operating means for said kvalve including an operating element having angularly related grasping portions disposed in juxtaposition with the grasping portions of said handle.

6. In a drilling mechanism, the combination with a pressure fluid actuated feeding means, and a drill supporting handle eX- tending laterally at one side of the drill and having angularly disposed grasping portions at its outer extremity, of feed controlling means including a. valve for enabling the operator to control the pressure in said feeding means in accordancewvth the requirements of the work, and operating means for said valve including a pivote/d element having angularly related manually grasping lever portions disposed in juxtaposition With the grasping portions of said handle.

7. In a drilling mechanism, the combi nation with a fluid actuated feeding means, and a drill supporting handle comprising manually graspable portionsdisposed at an angle to each other, of controlling means for said feeding means including a valve, and means for controlling the position of said valve including lever mechanism having angularly related arms operable by a hand resting upon either grasping portion of said handle.

8. In a drilling mechanism, the combination with fluid actuated feeding means and a drill supporting handle having angularly disposed manually graspalole portions, of controlling means for said feeding means including a valve movable in opposite direetions and operable When so moved respectively to interrupt fluid supply to saidy feeding means and both to interrupt fluid supply to said feeding means and open a vent therefrom, and means controlling said valve including lever mechanism having angularly related arms disposed adjacent said angularly disposed grasping portions, said arms being so disposed relative to said portions that when moved into parallelism thereto they effect movement of said valve in opposite direction.

In testimony whereof I affix my signature. i

ELMER G. GARTIN. 

